The AP Exams
The AP (Advanced Placement) exams are a part of the Advanced Placement Program which provides high school students the opportunity to take college level courses while still in high school. The program offers courses in certain subject areas, the exams are administered at the end of the course and if a student scores high enough, college credit may be awarded for that course work.
An AP course, if offered at your high school, is taken as part of your regular high school schedule. High school credit is awarded upon satisfactory completion of the course, and transcripts will have AP designation for such courses.
Having taught AP Calculus AB for several years, I am a strong advocate for the Advanced Placement Program. The course work is quite rigorous but can be very satisfying for the serious student.
The governing body of the PSAT, the SAT, and the AP exams is The College Board. Complete details of each exam, along with specific test dates and instructions for registration, can be found at The College Board's official website. I have listed the link on our Recommended Sites page. There is truly a wealth of information on this site for both students and parents, so plan to spend some time looking around while you're there.
Some recommended resources:
Barron's Test Prep
Kaplan Test Prep
The Princeton Review